Numerical simulation and experimental study of pressure and residence time distribution of triple‐screw extruder

Yang, Kunxiao; Xin, Chunling; Yu, Dongquan; Yan, Bangbo; Pang, Junjian; He, Yadong

doi:10.1002/pen.23883

Cited by 15 publications

(10 citation statements)

References 9 publications

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“…The materials firstly flow through the high shear region composed of three meshing zones to achieve distributive mixing, then enter the central area where melt stretching and dispersive mixing will be achieved. The whole process formed alternating shearing and extensional flow field, contributing to the efficient dispersion and mixing of the materials . However, the flow field in the twin screw extruder is usually dominated by the shear flow .…”

Section: Introductionmentioning

confidence: 99%

Effect of dispersed phase on the morphology of in situ microfibrils and the viscoelastic properties of its composite via direct extrusion

Xin

Huang

et al. 2018

J of Applied Polymer Sci

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A triangle arrayed triple-screw extruder was used to prepare in situ polypropylene (PP) microfibrillar composites (MFCs) by direct extrusion, in which polyamide 6,6 (PA66) and poly(butylene terephthalate) (PBT) were used as dispersed phases while PP as matrix phase. The morphological evolution of the dispersed phase were investigated by SEM through taking samples along the extruder from different positions. The results showed that the fibrillating mechanism of PA66 was entirely different from that of PBT. Dynamic oscillatory shear rheological properties were used to analyze the effect of different types of in situ microfibrils on the rheological properties of MFCs. The obtained results showed that the storage modulus and complex viscosity of both PP/PA66 and PP/PBT MFCs were improved with increasing fibrillar aspect ratios. The loss tangent tan d at low frequencies decreased with the increase of fibrillar aspect ratio. Moreover, the gel point concentration of PP/PA66 composite was lower than that of PP/PBT composite.attributed the increase in the viscosity to the formation of a physical PET fibrillar network which hinder the relaxation of the PP phase, as indicated from the frequency-independent tan d curve.Generally, Winter-Chambon analysis 15,16 is used to determine the gel point, 5 which is the critical fibril content at which a rheologically percolated network forms. The formation of such a network is a typical characteristic of the composites with deformable and long (means high aspect ratio) fibrils. 10,17 Rizvi and Park 10 and Kakroodi et al. 17 applied this method and found out that 3.0 wt % polyamide (PA) and 4.5 wt % PP were needed for the poly(lactic acid) and polyethylene (PE) systems, respectively, to form rheologically percolated network. The strain-hardening behavior of polymer blends with fibrillar morphology has been reported, and the dramatic improvement in strain-hardening response of PE was observed through the in situ fibrillation of 1 wt % PP. 17The preparation process of in situ MFCs is quite complex. There are many factors, including the viscosity, compatibility, and interfacial tension of the fibrillar phase and matrix, die structure, draw ratio, processing temperature, and so on, which influence fibrillation. 18,19 It can be summarized as two aspects: the first is the thermoplastic system, the second is the processing conditions. Currently, most of the MFCs are prepared by V C 2018 Wiley Periodicals, Inc.

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Section: Introductionmentioning

confidence: 99%

Effect of dispersed phase on the morphology of in situ microfibrils and the viscoelastic properties of its composite via direct extrusion

Xin

Huang

et al. 2018

J of Applied Polymer Sci

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“…Additionally, published data indicate that in triplescrew extruders the power consumption is 1.5 times higher than in co-rotating twin-screw extruders, while simultaneously their productivity increase around 1.3 times [34]. However, despite of above mentioned advantages of triple screw extrusion the research works about its application in polymer technology are still very limited [35][36][37], while its using during reactive processing is practically unknown. This is due to its high costs related to complicated screw geometry and barrel construction, comparing to single-or twin-screw extruders.…”

Section: Extruders As Chemical Reactors -Basic Conceptsmentioning

confidence: 99%

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

Formela¹,

Zedler²,

Hejna³

et al. 2018

Express Polym. Lett.

112

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Abstract.Reactive extrusion is a cost-effective and environmentally-friendly method to produce new materials with enhanced performance properties. At present, reactive extrusion allows in-situ polymerization, modification/functionalization of polymers or chemical bonding of two (or more) immiscible phases, which can be carried out on commonly used extrusion lines. Although reactive extrusion has been known for many years, its application for processing of bio-based polymer blends and composites is a relatively new direction of scientific research. This work presents a literature review on recent advances in the processing of bio-based polymer blends and composites via reactive extrusion. We described compatibilization mechanisms for different types of biodegradable polymeric materials based on: (i) aliphatic polyesters, (ii) aliphatic polyesters/starch and (iii) aliphatic polyester/natural rubber systems. A special attention was focused on conventional and dynamic cross-linking of bio-based polymer blends and composites as an effective way to prepare new materials with unique properties e.g. biodegradable thermoplastic elastomers or shape-memory materials. Advantages and limitations affecting future trends in development of biodegradable polymer blends and composites reactive extrusion are also discussed.

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“…To valid the numerical model, RTD experiment with calcined tracer was usually performed . The geometry of extruder (HT‐30, Nanjing Rubber and Plastics Machinery Plant Co., Ltd., China) were show in Fig.…”

Section: Numerical Simulationmentioning

confidence: 99%

3‐D numerical simulations for polycondensation of poly(p‐phenylene terephthalamide) in twin screw extruder

Zong

Tang

Zhao

2017

Polymer Engineering & Sci

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Poly(p-phenylene terephthalamide) (PPTA) is a typical high-performance fiber and usually synthesized by low temperature solution polycondensation in twin screw extruder. During the reactive extrusion, flow behavior, rheokinetics, and temperature are highly coupled, which makes it difficult to ensure the quality of product. In the present work, the rheokinetics of the PPTA solution is established by experiments and its reactive extrusion is investigated via 3-D numerical simulation. The flow pattern, molecular weight distribution and temperature have been investigated for the extruders with three different elements, i.e., full flight screw (FF), kneading block (KB), and screw mixing element (SME). The results indicate that the unique flow characteristic of different screw elements affects mixing experience of the reactants and further the PPTA qualities. By numerical simulation, it shows the temperature increase within the tested extrusion stage is 7 K and reaction heat is found the main energy source for extrusion stage. Furthermore, heat removal method is verified with consideration of industrial production process. The numerical simulation work also discusses the reaction and mixing process in the extruders with three combined screws. The results show the introduction of more reverse FF and KB elements can lead to higher quality of FIG. 2. Rheokinetics of PPTA during polycondensation: (a) effect of shear rate on viscosity. (b) Effect of M w on consistency index. [Color figure can be viewed at wileyonlinelibrary.com]

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Numerical simulation and experimental study of pressure and residence time distribution of triple‐screw extruder

Cited by 15 publications

References 9 publications

Effect of dispersed phase on the morphology of in situ microfibrils and the viscoelastic properties of its composite via direct extrusion

Effect of dispersed phase on the morphology of in situ microfibrils and the viscoelastic properties of its composite via direct extrusion

Reactive extrusion of bio-based polymer blends and composites – Current trends and future developments

3‐D numerical simulations for polycondensation of poly(p‐phenylene terephthalamide) in twin screw extruder

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